Acronym for Close of Business. Usually referring to a 5:00PM deadline.

Middle manager: "umm, if you could just get that done by COB, that would be terrrrrrrific."
Programmer: "sure, I'll get to that right away" ::what the hell, I guess I better do that right away...I'll look up COBB on Urban Dictionary::

The creature which creates cob-webs. Commonly mistaken as spiders; Cobs are a similar creature to the spider, ( a cousin to the spider if you will). Spider webs and cob webs are very commonly mistaken for one-another by the vast majority of the population because of close similarity. Cobs are also vary rare, due to environmental changes with in the past 30-40 years; one may hear an elderly person (an individual possibly over the age of 60-65) refer to spider webs as cob webs due to Cobs were more populous during the early 20th century and lurking in many tool sheds, garages, and basements across the country.

Homeowner: "There is nothing but spider webs in the attic, I think my house is infested with spiders."

Orkin Man: "Mrs, those aren't spider webs; those are surely cob-webs. Your house is infested with nearly extinct Cobs."